Hi all, I'm looking for a 140 mm glass dome port which I can use with my Isotta housing, and due to another post in this forum I have discover this HowShot dome ports which I didn't know. If anyone can give me information about the quality it would be great.

After upgrading to the Canon R6 mkII camera in Isotta housing I found out that the corners in the pictures with the 4" dome port are blurry, so I have to purchase a 6" dome port.

The options are Nauticam 140mm glass dome port, which are really expensive when I finally adapt it to my Isotta, I also can purchase Sea&Sea and Isotta 6" dome ports but this ones are plastic, and in these brands the glass domes are 6,5" which are to big for CFWA.

So this HowShot looks great in size and price, but I don't know anything about them.

I have an 6" Isotta dome to sell

Oups I checked it's a 6"5

"Isotta Glas Domeport 6.5" für Isotta DSLR"

Isotta have a 4.5"glass dome, you can also use a Nauticam 140mm dome by changing the lug ring to an Isottta/Sea and Sea lug ring.

8 minutes ago, CaolIla said:

Oups I checked it's a 6"5

"Isotta Glas Domeport 6.5" für Isotta DSLR"

I guess is it's too big for CFWA

1 minute ago, Chris Ross said:

Isotta have a 4.5"glass dome, you can also use a Nauticam 140mm dome by changing the lug ring to an Isottta/Sea and Sea lug ring.

I was told that new Nauticam version doesn't have the lug rig screwed to the body but machined with it, so if i find an old version second hand would be great. And the Isotta dealer in Spain doesn't recommend this 4,5" dome, he says i still will find blurry corners, a bit less that with the 4" but still a little bit. So I'm looking for different options. And today I have found this Howshot 140 mm dome ports https://www.divervision.com/products/howshot-140mm-optical-fisheye-port-for-seaandsea-nx-s120-mount-ofp-140-s120?_pos=2&_sid=f7fbcc98d&_ss=r

Which is glass, and looks like the Nauticam one but for pretty much half the price, but I don't have any reference of it. So basically at this moment I don't know what to do, the only thing I know is that I need a 6" dome port neither smaller nor bigger, I prefer glass, but If I don't find anyone which fits me in terms of money I'm open to plastic domes.